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<head>
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>可调侧栏</title>
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</head>
<body>
    <div class="scalable">
        <div>
            <ul>
                <li class="now">bg.jpg</li>
                <li>index.css</li>
                <li>index.js</li>
                <li>index.html</li>
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        <div class="content">
            <img src="./big1.jpg" alt="">
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